I think their role is very important. In major journals senior editors can reject papers without any review, at this great job they must have enough knowledge in that specific field of research, I think sometimes they have not and some great research works wasted by their job and unfortunately resulting misleading science. I mean If they want to do this job they have to be master in all fields and this is impossible!! I think senior editors role have to be just judging about formal points and not about conceptual advancement and all of the conceptual judgment have to be done by peer-reviewers. What do you think about this common problem in our scientific career?